trivial: fix ppc64le autopkgtest failure
trivial: fix ppc64le autopkgtest failure

nvme-self-test only runs if nvme is compiled, which it isn't for
ppc64le.

fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd